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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '359f20ce29787a51b0f065cc2c70b4172f9c749d89c4b1a8d066dc3f70772151' 
  AND token = 'CLJ+6FvPxr5iHZ+NGBw8yv0gc3mEvqF0fm1UUOwiO6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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