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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bedaf5cdbcd84a8183ac0c0550e88613fcf3236ecd8425a76506454fe3f7e1f5' 
  AND token = 'M3xRn0j0sxNPEoG9NB3KeFqrHxAmm2AwhrH8Sw4oMDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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