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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e027fb4e2130075bad0fc3e74ab67d9096fb98ec3ba93eb2b1293d95b4b04c2f' 
  AND token = 'iXa0Op+uRot1G9593PIOsZ9s3KiS6mnrhf7F+WiPjx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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