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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd05e8d8be845f6dc9c061da66ddc9bfa1ec32347f23ac4020c73e7e36f921d' 
  AND token = 't7+ZMRAFhig+rLXZb6MO9xpsuFiESs+6X5g4aeK8NZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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