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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18bf710d6e453706b719226605aaabaacdaf349a99d2f451a9fa7efe78f7f722' 
  AND token = 'zTAM6KpF2D0FxS5s1YR7pG1q2VXo/+iHEsz3jF4LwdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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