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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0df97ab9973b300c4598df68d863215681df663f2b50526b197b58ed1476182' 
  AND token = 'CmhknnCX6h6I7lCm1a8Fv9130T9zzL/Fnd2WtzHiOec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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