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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '761c82c1a03da7c20ab9ec473c1cff26732ddfe7d512be643db0cadcea310903' 
  AND token = 'j7prVZ/eisDM+anIKHxeBaP4eBRPjfvJjrLNsS6mhCY=' 
  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"
    }
  }
}