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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93ce71e0a6217de4a2d8dd87f6d57a0dea8201af6df5e72b1010fec74979637' 
  AND token = 'PLhg5vNVDBBfrexiw33w02JTGZJoRb2Jj/LJ3EFPNFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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