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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28791c711e85fb714785d457ce6d3a61ab43afbc76a2622ec5faac6d3d2ba485' 
  AND token = 'CeJRifbiKpzxLfHH+KqY+yMr7RVwoaInPe118G7HLMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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