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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4f58ae661bd3e71960f7dfaf2953d42cc7c2f1a965980c4223b6b3fb047b02' 
  AND token = 'yKZ4NzWHpfDE8/OB0zStepY5V50dG8D38rSMGTrcTHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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