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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977501dc885645c5775761de691de919cb5206f3dfa0e75ec8d4710b1c4c56ae' 
  AND token = 'NCeUn0YHupT8jimB3613bmFymX8AoRTX0/FBP9s+M+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}