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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199d91a5e043588dc9be422fb395162fb8492921be45af9b4b88932d5828608e' 
  AND token = '494MkPNrWc9r+2i5S0HqBtp2nES0U9HdAzqizZYkO5Q=' 
  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"
    }
  }
}