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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a42dbf8798bbc8007ed12f879cafd691e2ee5f183c1a16cef67835cced5e773' 
  AND token = 'Gy+z1PBr00PqWhDWzvQ2L2Q097K37iKGE0U9rlu666g=' 
  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"
    }
  }
}