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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692e86a45920603c1c492624eb1b3aeba13bb8a2eb2e488f16471cfde229e83a' 
  AND token = 'Nfnj9AUJFtqtlLLkvIXafh64taFk5pwFk7Jsneg45kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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