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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd300e1e8b2c18445c040fd45295603aafec24ec42e04c07df3befcd5e3f1787e' 
  AND token = 's2hiPPXFWk/DM2ufwbZ+0NNT/KlT/vbW3Y9KO5EJvEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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